Are air fryers healthier than deep frying?

What is different. An air fryer is a small countertop convection oven: a fan drives very hot air around food that carries only a thin coat of oil. In a head-to-head test on French fries, air frying gave substantially lower fat with similar moisture and color, but it took about 21 minutes instead of 9¹. Lower fat is the clearest and best-documented difference.

Acrylamide and other browning by-products. Acrylamide forms when starchy foods brown at high heat. Air frying cut acrylamide in fries by about 90 percent compared with deep frying at 180°C in one study², and by up to 47 percent in another³. Not every test agrees. In a third, air-fried potatoes had the highest acrylamide of three methods, though the differences were not statistically significant⁴, and biscuits from a static-basket air fryer had the most acrylamide of all, up to 1,320 micrograms per kilogram⁷. Within air frying, more browning meant more of these compounds³. Advanced glycation end products (AGEs), another browning by-product, were highest on deep-fried fish cakes, similar after air frying and pan frying, and lowest after baking⁸. See acrylamide and AGEs.

Meat. In air-fried chicken and beef, higher temperatures and searing raised heterocyclic amines and acrylamide, and marinades lowered the amines⁹.

Air quality. In a chamber study, an air fryer gave off 2.1 times more PM10 particles than a pan for chicken wings and 5.4 times more for chicken breast¹⁰. A later study found that, scaled to a small kitchen, air fryer emissions were substantially lower than conventional frying, but that residue left inside the machine over 70 uses raised emissions even with no food in it¹¹.

Nonstick baskets. If your basket has a nonstick coating, treat it like any nonstick pan. We found no published measurement of PFAS release from air-fryer baskets, so that question is open. See Teflon and PFAS.

Health outcomes. No study has followed people who switched to an air fryer. Studies of fried food in general point both ways^5,6.

Fat, time and texture. Teruel and colleagues compared French fries from deep fat frying and air frying under similar operating conditions. Air frying produced substantially lower fat with similar moisture and color, but needed about 21 minutes against 9, left less starch gelatinized, and gave different texture and sensory scores¹.

Acrylamide: studies that disagree. Sansano and colleagues fried potatoes at 180°C. Air frying cut acrylamide by about 90 percent compared with deep frying, without any pretreatment. Deep-fried potatoes soaked first in nicotinic acid, citric acid, 1 percent glycine or 2 percent salt also fell 80 to 90 percent, so a cheap soak can do what the appliance does². Dong and colleagues air-fried strips at 180 to 200°C for 12 to 24 minutes: acrylamide, hydroxymethylfurfural, methylglyoxal and glyoxal all rose steadily with temperature and time. Compared with deep frying at 180°C for 6 minutes, air frying lowered acrylamide by up to 47.3 percent and hydroxymethylfurfural by up to 57.0 percent³. Navruz-Varlı and Mortaş cooked washed or soaked potato sticks three ways. Mean acrylamide was 12.19 micrograms per kg for air frying, 8.94 for deep frying and 7.43 for oven frying, not a statistically significant difference. Soaking lowered acrylamide with every method, significantly so for deep frying (p = 0.029)⁴. Ekenci and colleagues baked biscuits at 175°C for 12 minutes in two air fryers and a conventional oven. Acrylamide ranged from 81 to 1,320 micrograms per kg by flour and device; the static-basket fryer produced the most, while the rotating-basket model matched the oven, and the authors concluded that air frying is not inherently safer than baking⁷. These are single-lab studies with different potatoes, oils, temperatures and machines, which probably explains the spread. They measure the food, not what happens in the eater.

AGEs and meat. Qin and colleagues heated fish cakes four ways. Surface AGEs rose with heating time and ranked deep frying above air frying and pan frying, with baking lowest, while the interior was barely affected⁸. Kwon and colleagues cooked chicken and beef in an air fryer. Higher temperatures and searing raised heterocyclic amines and acrylamide, especially in beef. Milk or beer marinades cut the amines in chicken by up to 60.6 percent, and turmeric cut them by 69.4 percent in beef⁹.

Indoor air. Wang and Chan compared a domestic air fryer with a pan. PM10 emissions were 2.1 times higher for chicken wings and 5.4 times higher for chicken breast, and volatile organic compounds were 2.5 times higher for fries and 4.8 times higher for chicken breast. Adding oil to the air fryer pushed PM10 for fries and asparagus to or above pan-frying levels¹⁰. Tang and colleagues measured 12 dishes in a 0.15 cubic metre chamber and found emissions varied by food. When scaled to a small kitchen, levels were substantially lower than conventional frying, and only high-fat foods gave ultrafine particles comparable to deep frying. Residue inside the machine after more than 70 uses raised volatile compounds by 23 percent and ultrafine particles by 236 percent with no food cooking¹¹. The two studies reach different conclusions, probably because of different foods, oil amounts and methods.

Do fried foods harm health? Qin and colleagues pooled 17 studies. Comparing the highest with the lowest fried-food intake, the relative risk was 1.28 (95% CI 1.15 to 1.43) for major cardiovascular events, 1.22 (1.07 to 1.40) for coronary heart disease and 1.37 (1.07 to 1.75) for heart failure, while stroke (1.37, 0.97 to 1.94) and all-cause mortality (1.03, 0.96 to 1.12) showed no clear link. Heterogeneity was high and recall bias is likely⁵. In the Spanish arm of the EPIC cohort, 40,757 adults followed for a median of 11 years, who fried mainly in olive and sunflower oil, the highest quarter of fried-food intake had a hazard ratio of 1.08 (0.82 to 1.43) for coronary heart disease and 0.93 (0.77 to 1.14) for death from any cause⁶. Neither examined air fryers. As for cancer, a meta-analysis of 32 publications found that dietary acrylamide was not related to the risk of most common cancers, with a borderline link for kidney cancer (relative risk 1.20, 1.00 to 1.45)¹².

What is missing. No trial or cohort has followed air-fryer users. We found no PFAS measurements for air-fryer baskets, and nothing on whether swapping appliances changes weight, blood fats or disease.

Bottom line (low confidence). An air fryer reliably cuts the oil in fried-style food. Whether it also cuts harmful by-products depends on the food, how brown you cook it and the machine, and a health benefit has not been shown.

Swaps, ranked by evidence

1. Eat fried and crisp starchy foods less often (best human evidence, but observational). Frequent fried-food eaters had more heart disease in pooled studies, though a large Spanish cohort found none^5,6.
2. Soak potatoes, cook to golden and avoid long, hot cooking (consistent lab evidence).^2,4,3
3. Air fry or oven bake instead of deep frying (lab evidence, depends on the device). Less fat and often less acrylamide, but one air fryer made more acrylamide than an oven^1,2,3,7.
4. Marinate meat and avoid hard searing (lab evidence).⁹
5. Ventilate the kitchen and clean the machine (chamber studies).^10,11